Sleep is important to a number of brain functions, including how nerve cells communicate with each other

Reduced brain function.
Headaches. Irritability. -Brain removes waste & plaque during sleep.
Higher Anxiety Levels:
Raises brain's anticipatory reactions & reduces stress response.

Weight Gain:
Sleep balances hormones that make you feel hungry or full. Elevates hunger hormone ghrelin.

Weakened Immunity:
Weakens body's immune response
Mood Imbalances.
Lack of sleep disrupts neurotransmitters to brain that regulate mood.

Increase Heart Disease Risk:
Blood pressure lowers during sleep. Increased stress raises BP.
Less than 5 hours of sleep may cause an increased risk of heart disease, stroke, and heart attacks.

Increased Diabetes Risk:
Lack of sleep increases cortisol & norepinephrine - both associated with insulin resistance.
Not sleeping prevents your body from releasing enough insulin, a hormone that lowers blood sugar levels

Poor coordination:
Reduces balance & increases risk of accidents.

LOW SEX DRIVE
Lack of sleep can lower sex hormone levels by 10-15%

FORGETFULNESS
Sleep helps our brains. to "lock in" information, helping store and secure thoughts in our minds.
Skin issues
Sleeplessness can make you more prone to wrinkles, fine lines and uneven skin tone.

Thanks for the info!